Find more details in the AWS Knowledge Center: https://aws.amazon.com/premiumsupport/knowledge-center/reset-admin-password/
Brandon, an AWS Cloud Support Engineer, shows you how to reset the administrator password on a Windows Server instance in Amazon EC2.
For a direct link to SSM automation: https://youtu.be/8bb6diA7hVI?t=6m49s
Publisher: Amazon Web Services
You can watch this video also at the source.